11g on Windows started all of a sudden to respond very slow on TNSPING

Here is the listener.ora and the tnsnames.ora
# listener.ora Network Configuration File: C:\app\administrator\product\11.2.0\dbhome_1\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1522))
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = odb1.domain.com)(PORT = 1522))
(PROTOCOL_STACK =
(PRESENTATION = GIOP)
(SESSION = RAW)
ADR_BASE_LISTENER = C:\app\administrator
# tnsnames.ora Network Configuration File: C:\app\administrator\product\11.2.0\dbhome_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
LISTENER_ODB =
(ADDRESS = (PROTOCOL = TCP)(HOST = odb1.domain.com)(PORT = 1522))
ODB =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = odb1.domain.com)(PORT = 1522))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = odb1.domain.com)
Symptoms:
1. the solution use to work like a breeze, until 10 days ago when problems started when after a windows update i restarted the machine.
2. The first time I do a tnsping, I get a response in 20 ms. After that every time I do the same it takes 5000 ms or more
3. Client can't connect anymore over the network (verified the tnsnames to be correct)
4. I can connect only using Local Bequeath connection.
I have seen several cases on the internet but nothing seems to match my case (windows OS)
steps already done: I did add the full name on the hosts file to expedite the resolution
restarted the listener after each change
Any help will be highly appreciated.
Thanks

I did it and I copy here the result of the file tnsping.trc:
Any idea?
Thanks
TNS Ping Utility for 32-bit Windows: Version 11.2.0.1.0 - Production on 29-SEP-2011 16:06:58
Copyright (c) 1997, 2010, Oracle. All rights reserved.
--- TRACE CONFIGURATION INFORMATION FOLLOWS ---
New trace stream is c:\trace\tnsping.trc
New trace level is 4
--- TRACE CONFIGURATION INFORMATION ENDS ---
--- PARAMETER SOURCE INFORMATION FOLLOWS ---
Attempted load of system pfile source C:\app\administrator\product\11.2.0\dbhome_1\network\admin\sqlnet.ora
Parameter source loaded successfully
-> PARAMETER TABLE LOAD RESULTS FOLLOW <-
Successful parameter table load
-> PARAMETER TABLE HAS THE FOLLOWING CONTENTS <-
TNSPING.TRACE_LEVEL = 4
NAMES.DIRECTORY_PATH = (TNSNAMES, EZCONNECT)
TNSPING.TRACE_DIRECTORY = c:\trace
SQLNET.AUTHENTICATION_SERVICES = (NTS)
--- PARAMETER SOURCE INFORMATION ENDS ---
--- LOG CONFIGURATION INFORMATION FOLLOWS ---
Log stream will be "standard output"
Log stream validation not requested
--- LOG CONFIGURATION INFORMATION ENDS ---
nnftmlf_make_local_addrfile: construction of local names file failed
nnftmlf_make_system_addrfile: system names file is C:\app\administrator\product\11.2.0\dbhome_1\network\admin\tnsnames.ora
nscall: connecting...
nsc2addr: (DESCRIPTION=(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=odb))(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.50)(PORT=1522)))
nttbnd2addr: using host IP address: 192.168.1.50
nsopen: opening transport...
nttcni: Tcp conn timeout = 60000 (ms)
nttcni: trying to connect to socket 1580.
nttcni: connected on ipaddr 192.168.1.50
nttcon: set TCP_NODELAY on 1580
nsopen: transport is open
nsopen: global context check-in (to slot 0) complete
nscon: doing connect handshake...
nscon: sending NSPTCN packet
nscon: got NSPTRF packet
nscall: refused
nstimarmed: no timer allocated
nsclose: closing transport
nsclose: global context check-out (from slot 0) complete

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